added skip pgp check for makepkg

This is useful when installing a new system and AUR packages need to be
installed before GnuPG is installed and configured (to automatically
retrieve public keys). E.g. cower requires PGP signature check and it needs
to be installed before pacaur can be installed and used for further AUR
package installation

README.md

@@ -19,6 +19,7 @@ makepkg will be used if no helper was found or if it's specified explicitly.
 |upgrade        |no       |no      |yes, no                                                      |Whether or not to upgrade whole system.|
 |use            |no       |auto    |auto, aurman, pacaur, trizen, pikaur, yaourt, yay, makepkg  |The helper to use, 'auto' uses the first known helper found and makepkg as a fallback.|
 |skip_installed |no       |no      |yes, no                                                      |Skip operations if the package is present.|
+|skip_pgp_check |no       |no      |yes, no                                                      |Skip verification of PGP signatures. This is useful when installing packages on a host without GnuPG (properly) configured. Only valid with makepkg.|
 
 ### Note
 * Either *name* or *upgrade* is required, both cannot be used together.

aur.py

@@ -72,6 +72,8 @@ def install_with_makepkg(module, package):
         tar.extractall()
         tar.close()
         os.chdir(format(result['Name']))
+        if module.params['skip_pgp_check']:
+            use_cmd['makepkg'].append('--skippgpcheck')
         rc, out, err = module.run_command(use_cmd['makepkg'], check_rc=True)
         os.chdir(current_path)
     return (rc, out, err)
@@ -131,6 +133,10 @@ def main():
                 'default': False,
                 'type': 'bool',
             },
+            'skip_pgp_check': {
+                'default': False,
+                'type': 'bool',
+            },
         },
         required_one_of=[['name', 'upgrade']],
         supports_check_mode=True